|
Un article trouvé pour ce sujet.
 |
|
|
|
|
|
|
|
|
Incremental variance |
2004-09-23 |
|
Carlos pose la question :
I must keep statistical data (mean and variance) in 3 granularity levels depending on the age of the data (daily for older than 1 year, hourly for older than 1 month and quarter-hour for older than 1 day). How can I calculate the resulting variance from a set of variances previously calculated supposing I have the count and mean for each member of the set?
Andrei Volodin and Penny Nom lui répond. |
|
|
|
